The Elder Scrolls V: Skyrim

Alright, this isn't a problem with my computer, I doubt. Recently built a new computer which has a great graphics card. One thing, after playing skyrim a bit I am now getting a bit of lag. When I turn fast I can see the game lag. Then I set my computer to 'High' instead of Ultra High. Nothing changed. So I enabled triple buffering and vsync on my nvidia control panel, which is supposed to do wonders. Nothing happened again.

How can this be? My computer naturally wants to run Ultra High but it lags. Even by switching it down I get nothing to change. Is it a mod?

Edit: If it helps I did have a bit of mouse lag before triple buffering. After it was enabled that lag disappeared. But the lag I get from turning swiftly was not even effected

On an Ultra High setting I have 60 fps which is pretty good. I don't feel like this is due to computer performance, it seems to me it might be a mod that is causing this. Are there any common mods that would have a lag issue?

I had a Water Enhancement Mod, now deleted. Well, I have a lot of mods which is probably a contributing factor, but armor mods don't cause much a problem. The large ones are expanding towns and cities, changes to Whiterun to add more trees and markets. Solitude is nicer. Cities look better. Those would have an impact. I have Falskaar.

I probably won't post the list, it would be long, which like I said probably contributes to it. I also have weather mods like Climates of Tamriel, Hypothermia, etc.

I had a Water Enhancement Mod, now deleted. Well, I have a lot of mods which is probably a contributing factor, but armor mods don't cause much a problem. The large ones are expanding towns and cities, changes to Whiterun to add more trees and markets. Solitude is nicer. Cities look better. Those would have an impact. I have Falskaar.

I probably won't post the list, it would be long, which like I said probably contributes to it. I also have weather mods like Climates of Tamriel, Hypothermia, etc.

post a list... i have seen mod lists with over 200 mods here, we can take it :D